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Derivatives (Embedded Derivatives) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts $ (767)   $ (767)   $ (649)
Nonperformance Risk [Member]          
Derivatives, Fair Value [Line Items]          
Net derivatives gains (losses) 39 $ 3 43 $ (48)  
Ceded guaranteed minimum benefits | Premiums, reinsurance and other receivables          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within asset host contracts 27   27   38
Direct guaranteed minimum benefits | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts (578)   (578)   (324)
Assumed guaranteed minimum benefits | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts (99)   (99)   (98)
Funds withheld and guarantees on reinsurance | Other liabilities          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts         (57)
Fixed annuities with equity indexed returns [Member] | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts (126)   (126)   (165)
Other guarantees | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts 0   0   $ (5)
Funds withheld and guarantees on reinsurance | Other liabilities          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts $ (36)   $ (36)